1565491216 has 10 divisors (see below), whose sum is σ = 3033139262. Its totient is φ = 782745600.

The previous prime is 1565491171. The next prime is 1565491217. The reversal of 1565491216 is 6121945651.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1401753600 + 163737616 = 37440^2 + 12796^2 .

It is not an unprimeable number, because it can be changed into a prime (1565491217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48921585 + ... + 48921616.

Almost surely, 2^1565491216 is an apocalyptic number.

1565491216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1565491216 is a deficient number, since it is larger than the sum of its proper divisors (1467648046).

1565491216 is an equidigital number, since it uses as much as digits as its factorization.

1565491216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97843209 (or 97843203 counting only the distinct ones).

The product of its digits is 64800, while the sum is 40.

The square root of 1565491216 is about 39566.2888833411. The cubic root of 1565491216 is about 1161.1372161075.

The spelling of 1565491216 in words is "one billion, five hundred sixty-five million, four hundred ninety-one thousand, two hundred sixteen".